This product works wonders in terms of alleviating fatigue, muscle pain and feeling blah. Just one capsule on an empty stomach does the trick for me but I take them 3 times/day. One can feel a surge of energy shortly after taking it but it's not the jittery kind like coffee. Also helps with headaches - dilates the arteries etc. iHerb has the best price!!
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I've taken all forms of carnitine, for years.
I now avoid these
Acetyl- version (took for ten years) is stimulating (acetyl groups stimulate brain), but I eventually realized that it makes me nervous and makes my stomach acidy.
Tartrate seems a bit harsh on stomach.
HOWEVER, there are some really good ones.
Plain l-carnitine Liquid Cap (Jarrow) is great.
L-carnitine fumarate is great.
Propionyl l-carnitine is great (THIS ONE).
Liquid l-carnitine is great.
All of these should be taken on empty stomach a while before eating.